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Re: Midnight Commander Quick View

From: Alin
Subject: Re: Midnight Commander Quick View
Date: Mon, 25 Aug 2014 22:30:36 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux)

Stefan Monnier <address@hidden> writes:

>> (setq lexical-binding t)
> Don't do that.  This will set lexical-binding during *execution*,
> whereas that option is needed during compilation.
> Furthermore, it will set it such that it will affect everything rather
> than only code in this file.

setting lexical-binding has nothing to do with the code (apart that it
must be set buffer-local, for this code to work).

Here is an updated version, that works quite nice, and is fast.

(defun qv ()
  (let ((i 0))
    (let ((config (current-window-configuration)))
      (defun qv-remove-other-buffer ()
          (other-window 1)
          (and buffer-read-only
               (not (buffer-modified-p))
               (kill-buffer (window-buffer)))))
      (defun qv-update ()
        (let ((f (dired-get-filename t t)))
          (when (and (stringp f) (file-regular-p f)
                     (< (nth 7 (file-attributes f)) 1e7))
            (when (not (equal (window-buffer)
                                (window-buffer (other-window 1)))))
            (let ((auto-mode-alist))
              (view-file-other-window f))
            (other-window 1)
            (message "View file %s. Press C-q to quit quick-view." f))))
      (add-hook 'post-command-hook 'qv-update 'at-the-end t)
      (lambda (message)
        (defun exit ()
          (setq-local quick-view-object nil)
          (define-key dired-mode-map
            [(control ?c) (control ?q)]
          (setq i (1- i))
          (set-window-configuration config)
          (remove-hook 'post-command-hook 'qv-update t)
          (message "exit qv"))
        (apply message '())))))

(setq-local qv-binding
    (lambda (&optional arg)
      (setq-local quick-view-object (qv))
      (define-key dired-mode-map [(control ?c) (control ?q)]
        (lambda (&optional arg)
          (dired-next-line 1)
          (apply quick-view-object (list 'exit))))))

(define-key dired-mode-map
  [(control ?c) (control ?q)]

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